Mach number is significant in_____________________?

A. none of the above

B. simultaneous motion through two fluids where there is a surface of dis-continuity, gravity force, and wave making effects, as with ships hulls

C. supersonics, as with projectiles and jet propulsion

D. all of fhe above

E. full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc.

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